S-97768A325 1/4"-20 ASME B18.3 Shoulder Screws
Shoulder Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing applications.
- Precise alignment and smooth rotation ensured by the 1 7/8" shoulder with controlled diameter tolerance.
- Secure, high-precision threading with Class 3A UNC coarse thread fit for easy assembly and vibration resistance.
- Easy installation and removal using a standard 5/32" hex drive and knurled socket head for improved grip.
- Long-lasting durability backed by Rockwell B55 hardness, maintaining performance under repeated use.
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for safe, regulated use.
Professional Applications & Engineering Value
This shoulder screw is engineered to address common challenges in machinery assembly, such as component misalignment and wear. The 18-8 stainless steel material, combined with a black oxide finish, provides excellent resistance to corrosion and oxidation, extending service life in demanding settings like automotive, aerospace, and industrial equipment. The 1/4"-20 UNC coarse thread and Class 3A fit ensure tight, reliable fastening that withstands vibrations, while the precisely machined shoulder acts as a pivot or spacer, reducing friction and improving rotational accuracy. Ideal for use in pivoting joints, gear assemblies, and conveyor systems, this screw delivers consistent performance, minimizing downtime and maintenance costs.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for high precision, a shoulder diameter of 5/16" with tolerance of -0.004" to -0.002", and a shoulder length of 1 7/8" with tolerance of -0.005" to 0.005". It complies with ASME B18.3 specifications for dimensional accuracy and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets environmental and safety regulations for industrial applications.
